diff --git a/toolkit/components/console/hudservice/tests/browser/browser_warn_user_about_replaced_api.js b/toolkit/components/console/hudservice/tests/browser/browser_warn_user_about_replaced_api.js
index b9517a826a3b..64ed38e42935 100644
--- a/toolkit/components/console/hudservice/tests/browser/browser_warn_user_about_replaced_api.js
+++ b/toolkit/components/console/hudservice/tests/browser/browser_warn_user_about_replaced_api.js
@@ -57,6 +57,7 @@ function testOpenWebConsole()
   hudId = HUDService.displaysIndex()[0];
   hud = HUDService.getHeadsUpDisplay(hudId);
 
+  HUDService.logWarningAboutReplacedAPI(hudId);
   testWarning();
 }
 
diff --git a/toolkit/components/console/hudservice/tests/browser/test-console-replaced-api.html b/toolkit/components/console/hudservice/tests/browser/test-console-replaced-api.html
index 132df9c04eba..30a10aff654b 100644
--- a/toolkit/components/console/hudservice/tests/browser/test-console-replaced-api.html
+++ b/toolkit/components/console/hudservice/tests/browser/test-console-replaced-api.html
@@ -1,11 +1,15 @@
 <!DOCTYPE HTML>
 <html dir="ltr" xml:lang="en-US" lang="en-US"><head>
     <title>Console test replaced API</title>
+    <script type="text/javascript">
+      function replaceAPI() {
+        var console = {log: function (msg){}, info: function (msg){}, warn: function (msg){}, error: function (msg){}};
+        window.console = console;
+      }
+    </script>
   </head>
   <body>
     <h1 id="header">Web Console Replace API Test</h1>
-    <script type="text/javascript">
-      window.console = {log: function (msg){}, info: function (msg){}, warn: function (msg){}, error: function (msg){}};
-    </script>
+    <button onclick="replaceAPI();">ReplaceAPI</button>
   </body>
 </html>
